移动端触屏事件
作者：microsoftvs 更新时间：2019/8/9 15:29:27 点击数：939
JS实现移动端触屏拖拽功能
实现代码，请在端预览，PC端无效果
<!DOCTYPE html>
<html>
<head>
<meta set="UTF-8">
<title>ss</title>
<style>
* {
touch-action: pan-y;
margin: 0;
padding: 0;
}
html, body {
width: 100%;
height: 100%;
}
#div1 {
width: 50px;
height: 50px;
background: cyan;
position: absolute;
}
</style>
<script typet="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<h3>请在端预览，PC端无效果</h3>
<div id="div1"></div>
<script>
var div1 = document.querySelector('#div1');
//限制最大宽高，不让滑块出去
var maxW = document.body.clientWidth - div1.offsetWidth;
var maxH = document.body.clientHeight - div1.offsetHeight;
//手指触摸开始，记录div的初始位置
div1.addEventListener('touchstart', function(e) {
var ev = e || window.event;
var touch = ev.targetTouches[0];
oL = touch.clientX - div1.offsetLeft;
oT = touch.clientY - div1.offsetTop;
document.addEventListener("touchmove", defaultEvent, false);
});
//触摸中的，位置记录
div1.addEventListener('touchmove', function(e) {
var ev = e || window.event;
var touch = ev.targetTouches[0];
var oLeft = touch.clientX - oL;
var oTop = touch.clientY - oT;
if (oLeft < 0) {
oLeft = 0;
} else if (oLeft >= maxW) {
oLeft = maxW;
}
if (oTop < 0) {
oTop = 0;
} else if (oTop >= maxH) {
oTop = maxH;
}
div1.style.left = oLeft + 'px';
div1.style.top = oTop + 'px';
});
//触摸结束时的处理
div1.addEventListener('touchend', function() {
document.removeEventListener("touchmove", defaultEvent);
});
//阻止默认事件
function defaultEvent(e) {
e.preventDefault();
}
</script>
</body>
</html>